High frequency of PTEN mutations in nevi and melanomas from xeroderma pigmentosum patients.

Abstract:

:We examined nevi and melanomas in 10 xeroderma pigmentosum (XP) patients with defective DNA repair. The lesions had a lentiginous appearance with markedly increased numbers of melanocytes. Using laser capture microdissection, we performed DNA sequencing of 18 benign and atypical nevi and 75 melanomas (melanoma in situ and invasive melanomas). The nevi had a similar high frequency of PTEN mutations as melanomas [61% (11/18) versus 53% (39/73)]. Both had a very high proportion of UV-type mutations (occurring at adjacent pyrimidines) [91% (10/11) versus 92% (36/39)]. In contrast to melanomas in the general population, the frequency of BRAF mutations (11%, 7/61), NRAS mutations (21%, 13/62), and KIT mutations (21%, 6/28) in XP melanomas was lower than for PTEN. Phospho-S6 immunostaining indicated activation of the mTOR pathway in the atypical nevi and melanomas. Thus, the clinical and histological appearances and the molecular pathology of these UV-related XP nevi and melanomas were different from nevi and melanomas in the general population.

authors

Masaki T,Wang Y,DiGiovanna JJ,Khan SG,Raffeld M,Beltaifa S,Hornyak TJ,Darling TN,Lee CC,Kraemer KH

doi

10.1111/pcmr.12226

subject

Has Abstract

pub_date

2014-05-01 00:00:00

pages

454-64

issue

3

eissn

1755-1471

issn

1755-148X

journal_volume

27

pub_type

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